Support checkpoint metadata
Currently when creating a checkpoint. The only place to add custom
information apart from the name is in the description field. This means
that tools that create checkpoints needs to use this user visible space
for their own metadata.
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Support checkpoint metadata
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Add metadata parameter to checkpoint API
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Add metadata parameter to checkpoint API
Addressed by: https:/
Add metadata parameter to checkpoint API
Addressed by: https:/
Updata the api definition of checkpoint API